【題目】①He not ( post) the letter yet .②He not ( post)the letter an hour ago .

【答案】has;posted;did;post
【解析】①句意:他還沒有寄信。yet是現(xiàn)在完成時的標(biāo)志,其結(jié)構(gòu)為have/has+過去分詞,主語是he,用has,所以答案是has posted。
②句意:他一個小時前沒有寄信。ago是一般過去時的標(biāo)志,此處是否定句,含有實(shí)意動詞post,否定借助助動詞did,后接動詞原形,所以答案是did;post。

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